Dual-Band and Dual Circular Polarization Microstrip Antennas for Portable RFID Readers

2021 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM) Pub Date : 2021-11-28 DOI:10.1109/iwem53379.2021.9790687

Yujie Wang, Z. Xue, W. Ren, Weiming Li

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Abstract

This paper proposes a dual-band and dual-circularly polarized antenna with common-port plane, duplex and dual-port. The proposed antenna uses stacked concentric radiating patches, the low frequency band of the circular patch is used for the low frequency band, and the circular patch is used for the high frequency band to achieve antenna frequencies of 0.92 GHz and 2.45 GHz, respectively. The two patches are respectively excited by two microstrip feed networks with a 90° phase shift (sequential rotation feed technology). In order not to increase the area of the entire antenna, the low-frequency antenna is stacked under the high-frequency antenna. The impedance bandwidth of the antenna in the 0.92 GHz and 2.45 GHz frequency bands are 17.3% and 36.3%, the 3 dB axial ratio bandwidth is 17.2% and 23.4%, and the peak gain is 6.1 dB and 5.3 dB, respectively. The antenna realizes left and right circular polarization in dual frequency bands, which provides more possibilities for radio frequency identification reading applications..

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用于便携式RFID阅读器的双频和双圆极化微带天线

提出了一种具有共口平面、双工、双口的双频双圆极化天线。该天线采用堆叠的同心辐射贴片，低频采用圆形贴片的低频频段，高频采用圆形贴片，分别实现0.92 GHz和2.45 GHz的天线频率。两个贴片分别由两个具有90°相移的微带馈电网络(顺序旋转馈电技术)激发。为了不增加整个天线的面积，将低频天线叠加在高频天线下面。天线在0.92 GHz和2.45 GHz频段的阻抗带宽分别为17.3%和36.3%，3db轴比带宽分别为17.2%和23.4%，峰值增益分别为6.1 dB和5.3 dB。天线实现了双频段的左右圆极化，为射频识别读取应用提供了更多的可能性。

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2021 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)

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